Definition - What does Discrete Sliplining mean?
Discrete sliplining, also known as segmental sliplining, is a trenchless rehabilitation method that is carried out by inserting pipe segments into the host pipe. Short segments of pipe, usually shorter than the host pipe, are inserted one after the other, which creates a new pipe within the old one.
Trenchless rehabilitation methods eliminate the need for removing the old pipe entirely as is done in the case of repair using open cut methods.
Trenchlesspedia explains Discrete Sliplining
Short sections of pipe are joined outside of the pipeline to form a continuous lining. The joint can be done using snap lock joints, collars or by screw threads provided on the pipe ends. The annular space between the pipes can be sealed with grout. This method requires even less working space.
Depending on the size of the pipe and material used, manned entry or non-manned entry is used. Glass reinforced plastic (GRP), high-density polyethylene (HDPE) and polyethylene (PE) pipes can be used for this method.
Discrete sliplining is quick, can be used to line large radius bends, can be used to line cross sections that are non-circular and can be carried out without bypass pumping in lines that have low flow. The only drawback is the reduction in pipe cross section because the diameter of the new pipe is smaller than the host pipe.